SmogRank / History / City race
Cities in Hong Kong, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities in Hong Kong for PM2.5 over the 30 days to 12 Aug 2025: Wan Chai 20.9 µg/m³, Fanling 14.1 µg/m³ and Tuen Mun 12.6 µg/m³.
- 1Wan ChaiWan Chai20.9
- 2FanlingNorth District14.1
- 3Tuen MunTuen Mun12.6
- 4Kwai ChungKwai Tsing District12.5
- 5Tin Shui WaiYuen Long11.6
- 6San Tung Chung HangIslands11.3
- 7Tai PoTai Po11.1
- 8Tsuen WanTsuen Wan11.0
- 9Sham Shui PoSham Shui Po District10.8
- 10Sau Mau PingKwun Tong District10.8
- 11Mong KokYau Tsim Mong District10.6
- 12Sha TinSha Tin8.9
- 13VictoriaCentral and Western8.3
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.